Air Assisted Injector Control Circuit High
The P0067 code indicates that the Powertrain Control Module (PCM) has detected a high voltage or resistance in the air assisted injector control circuit. This circuit controls the air injection system that helps atomize fuel during cold starts and certain driving conditions. A high signal suggests an open circuit, short to voltage, or faulty component, which can disrupt air-fuel mixture and cause drivability issues.
1. Most Common Causes
- Faulty air assisted injector solenoid
- Open or shorted wiring in the control circuit
- Corroded or loose electrical connector
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Poor fuel economy
- Hard starting, especially when cold
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm the code.
Step 2: Visually inspect the air assisted injector wiring and connector for damage, corrosion, or loose pins.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 10-30 ohms).
Step 4: Check for voltage at the solenoid connector with key on; should be battery voltage. If not, trace circuit for opens/shorts.
Step 5: If all checks pass, replace the air assisted injector solenoid.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor performance, increased emissions, and potential damage to other components. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether the solenoid or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.